Steel 51100 Annealed vs 51100 QT 60-64 HRC
Steel · 51100 temper comparison
51100 Annealed and 51100 QT 60-64 HRC are two conditions of the same steel grade, 51100: Annealed versus QT 60-64 HRC. The chemistry is identical, so every difference below comes from the condition. 51100 QT 60-64 HRC is the stronger of the two: yield strength 1,800 MPa (261 ksi) against 400 MPa (58 ksi) for 51100 Annealed, about 4.5 times as much; tensile strength follows at 2,200 MPa (319 ksi) vs 640 MPa (92.8 ksi). In exchange, 51100 Annealed is the more ductile: elongation 25% versus 1% for 51100 QT 60-64 HRC, and 51100 QT 60-64 HRC is harder (750 HV vs 200 HV). 51100 Annealed runs hotter in service (400°C vs 150°C continuous) and 51100 Annealed conducts heat better (46 W/m·K vs 36 W/m·K). On the shop floor, 51100 Annealed machines more easily (fair vs not recommended).
51100 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
51100 QT 60-64 HRCChoose it when strength drives the design.
51100 Annealed vs 51100 QT 60-64 HRC: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
51100 Annealed51100 QT 60-64 HRC
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Brinell 192 HB · Hardness, Rockwell B 91 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.81 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,415°C2,579 °F · Liquidus Temperature 1,460°C2,660 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.9 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 10 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Polishability
Same in both: Weldability 12 / 100 · Castability 30 / 100 · Brazeability / Solderability 35 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.4 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 25%
Strength versus weight
Yield strength against density for every steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
51100 Annealed vs 51100 QT 60-64 HRC — frequently asked
Is 51100 QT 60-64 HRC stronger than 51100 Annealed?
Yes. 51100 QT 60-64 HRC has a typical yield strength of 1,800 MPa (261 ksi) against 400 MPa (58 ksi) for 51100 Annealed — about 4.5 times as much. Tensile strength is 2,200 MPa (319 ksi) vs 640 MPa (92.8 ksi).
Which condition does FabDigit quote by default, Annealed or QT 60-64 HRC?
Annealed is the default 51100 condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, 51100 Annealed or 51100 QT 60-64 HRC?
51100 Annealed. Its machinability rates fair (45/100) against not recommended (8/100) for 51100 QT 60-64 HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 51100 Annealed and 51100 QT 60-64 HRC side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.